Airsoft parts are not illegal to import, such as triggers, stocks, magazines, etc. the only things you may have issue with is certain receivers or frames relating directly to assault weaponry or pistols. The main body or housing basically could be deemed a no go, but probably not. Stocks and housings for say shotguns and rifles shouldn't be an issue, but as far as parts go, like scopes, barrels, internals, etc, there's no issue, unless of course it is a real gun internal and by real I mean a mechanism piece, not like a body pin, grip or stock.

This.

Sad part is even with the current CAD, 99% of parts are still cheaper to order from over-seas then to buy here in Canada.